Frederick John Oeltjen, PH.D.
Clinical Psychologist · Rockville, MD
Frederick John Oeltjen, PH.D. is a clinical psychologist with a practice address in Rockville, Maryland, and NPI 1942348487, issued on Feb 4, 2007. Check the license (Maryland 01189, as entered in NPPES) with the Maryland board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Frederick John Oeltjen
- Credential
- PH.D.
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License numbers
- 01189 MD
PSY964 DC
Self-reported in NPPES; status is on the state search - Practice location
- 20 Courthouse SQ, Rockville, MD 20850
- Phone
- (301) 424-6955
- Enumerated
- Feb 4, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (301) 424-4836
- Entity
- Type 1 · individual
8 nearest clinical psychologist records → All 1,499 in Maryland → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Frederick John Oeltjen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license 01189Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Frederick John Oeltjen among 1,499 clinical psychologist records in Maryland
Frederick John Oeltjen, PH.D. is one of 1,499 clinical psychologist records with a practice address in Maryland. 10% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 19% of them.
- NPI issued2007 · 19% of these records are older, 61% newer
- In a Medicare fileNo · 10% of these records are
- In the CMS Doctors and Clinicians fileNo · 18% of these records are
- Record last updated2007 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
94 clinical psychologist records list a practice address in Rockville
They are 94 of the 14,353 NPPES records with a practice address in Rockville, and 1,499 clinical psychologist records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 1,499 in Maryland → Every provider in Rockville → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Esther Bernays, PHDRockville, MD 208501447384201
- Lauren Caravella, PSY.DRockville, MD 208501336287879
- Joshua Cohen, PH.D.Rockville, MD 208501184740839
- David Cueva, PSY.D.Rockville, MD 208501306972450
- Wayne Evans, PH.D.Rockville, MD 208501831220979
- Paul Gedo, PH.D.Rockville, MD 208501003021924
- Matthew Gonzalez, PSY.D.Rockville, MD 208501497701361
- Judith Hanono-Yaron, PH.D.Rockville, MD 208501952522021
Common questions
What is Frederick John Oeltjen, PH.D.'s NPI number?
Frederick John Oeltjen, PH.D.'s National Provider Identifier (NPI) is 1942348487, issued on Feb 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Frederick John Oeltjen, PH.D. located?
The NPPES record lists a practice address at 20 Courthouse SQ, Rockville, MD, 20850. Phone: (301) 424-6955. Providers update this record themselves, so call before visiting.
How can I verify Frederick John Oeltjen, PH.D.'s license?
NPPES lists Maryland license number 01189, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.